公开(公告)号：BRPI0512898A

公开(公告)日：2008-04-15

申请号：BRPI0512898

申请日：2005-07-04

Applicant: CANON KK

Inventor： TAKAYAMA HIDEKI ,  MAFUNE KUMIKO ,  OKAMURA DAIJI ,  SATO SHI-ICHI ,  YOSHIZAWA JUN ,  NAKAMURA KUNIHIKO

IPC: B41J2/01 ,  B41M5/00 ,  C09B33/18 ,  C09B35/64 ,  C09D11/00 ,  C09D11/322 ,  C09D11/326 ,  C09D11/328 ,  C09D11/38

Abstract: The present invention aims to provide an ink jet black ink which can improve weatherability, optical density and sticking recovery property of nozzles of a recording head. According to the present invention, an ink jet black ink is provided which comprises at least a coloring material and a water-soluble organic solvent, wherein the coloring material is a compound represented by the following general formula (I) or a salt thereof, and the water-soluble organic solvent is a water-soluble organic solvent having a relative permittivity of from 30.0 or more to less than 70.0 at 20°C and capable of dissolving the compound represented by the following general formula (I) or a salt thereof, by 1.0 mass% or more at 25°C, and is in a content of 50.0 mass% or more with respect to the total content of all water-soluble organic solvents contained in the ink jet black ink.